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/* SPDX-License-Identifier: copyleft-next-0.3.1 */
/* Copyright 2021 - 2022, Kim Kuparinen < kimi.h.kuparinen@gmail.com > */
/**
* @file proc.c
* Process handling, might be merged into \ref src/tcb.c.
*/
#include <kmi/elf.h>
#include <kmi/proc.h>
#include <kmi/conf.h>
#include <kmi/debug.h>
#include <kmi/string.h>
#include <kmi/initrd.h>
#include <arch/arch.h>
#include <arch/proc.h>
#include <arch/cpu.h>
#include <libfdt.h>
stat_t prepare_proc(struct tcb *t, vm_t bin, vm_t interp)
{
vm_t entry = load_elf(t, bin, interp);
if (!entry)
return ERR_INVAL;
alloc_stack(t);
set_thread(t);
set_return(t, entry);
return OK;
}
stat_t init_proc(void *fdt, vm_t *proc_fdt, vm_t *proc_initrd)
{
init_tcbs();
/** \todo cleanup or something */
struct tcb *t = create_proc(NULL);
if (!t)
return ERR_OOMEM;
/* we're the first cpu, so we always have ID 0 */
t->cpu_id = 0;
/* force tcb for core */
tcb_assign(t);
t->notify_id = t->tid;
/* init process has all capabilities */
set_caps(t->caps, 0,
CAP_CAPS | CAP_PROC | CAP_SIGNAL | CAP_POWER | CAP_NOTIFY);
/* we shall try to map the fdt and initrd into the new address space, so
* save them here before we switch */
use_tcb(t);
/* allocate stacks etc after ELF file to make sure nothing of importance
* clashes */
prepare_proc(t, get_init_base(fdt), 0);
/** \todo start one thread per core, with special handling for init in
* that each thread starts at the entry point of init? */
*proc_fdt = map_fixed_mem(t,
(pm_t)fdt, fdt_totalsize(fdt),
VM_V | VM_R | VM_U);
pm_t initrd = (pm_t)__va(get_initrdbase(fdt));
*proc_initrd = map_fixed_mem(t,
initrd, get_initrdsize(fdt),
VM_V | VM_R | VM_U);
info("mapped fdt at %p\n", (void *)*proc_fdt);
info("mapped initrd at %p\n", (void *)*proc_initrd);
return OK;
}
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